Northern Industrial Welders Digital Large View Variable-Shade Welding Helmet - Auto-Darkening Extra large 3.82 in. x 2.44 in. viewing area Variable shade features 3 modes - cutting: 5-8; welding: 8-13 and grinding: 4, to cover all welding processes including gas welding/cutting 4 arc sensors, one in each corner, accurately detect arc light ATC circuit board produces the same shading in the center and corners Fast switching speed (1/25,000 second reaction time)